Update start date for giving tuesday reminders

Author: tomrf1

src/shared/lib/reminderFields.ts

@@ -75,7 +75,7 @@ export const buildReminderFields = (today: Date = new Date()): ReminderFields =>
 
 const newYearsEve = new Date('2023-12-31');
 const givingTuesdayReminderStart = (date: Date): Date => {
-    return new Date(date.getFullYear(), 9, 20); // October 20th (provisional auto start date, to be confirmed)
+    return new Date(date.getFullYear(), 10, 15); // November 15th
 };
 
 // Giving Tuesday is 'active' from October 20th until the day before Giving Tuesday